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Diffstat (limited to 'drivers/dma-buf/Kconfig')
| -rw-r--r-- | drivers/dma-buf/Kconfig | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig new file mode 100644 index 0000000000..e4dc53a364 --- /dev/null +++ b/drivers/dma-buf/Kconfig @@ -0,0 +1,94 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "DMABUF options" + +config SYNC_FILE + bool "Explicit Synchronization Framework" + default n + select DMA_SHARED_BUFFER + help + The Sync File Framework adds explicit synchronization via + userspace. It enables send/receive 'struct dma_fence' objects to/from + userspace via Sync File fds for synchronization between drivers via + userspace components. It has been ported from Android. + + The first and main user for this is graphics in which a fence is + associated with a buffer. When a job is submitted to the GPU a fence + is attached to the buffer and is transferred via userspace, using Sync + Files fds, to the DRM driver for example. More details at + Documentation/driver-api/sync_file.rst. + +config SW_SYNC + bool "Sync File Validation Framework" + default n + depends on SYNC_FILE + depends on DEBUG_FS + help + A sync object driver that uses a 32bit counter to coordinate + synchronization. Useful when there is no hardware primitive backing + the synchronization. + + WARNING: improper use of this can result in deadlocking kernel + drivers from userspace. Intended for test and debug only. + +config UDMABUF + bool "userspace dmabuf misc driver" + default n + depends on DMA_SHARED_BUFFER + depends on MEMFD_CREATE || COMPILE_TEST + help + A driver to let userspace turn memfd regions into dma-bufs. + Qemu can use this to create host dmabufs for guest framebuffers. + +config DMABUF_MOVE_NOTIFY + bool "Move notify between drivers (EXPERIMENTAL)" + default n + depends on DMA_SHARED_BUFFER + help + Don't pin buffers if the dynamic DMA-buf interface is available on + both the exporter as well as the importer. This fixes a security + problem where userspace is able to pin unrestricted amounts of memory + through DMA-buf. + This is marked experimental because we don't yet have a consistent + execution context and memory management between drivers. + +config DMABUF_DEBUG + bool "DMA-BUF debug checks" + depends on DMA_SHARED_BUFFER + default y if DMA_API_DEBUG + help + This option enables additional checks for DMA-BUF importers and + exporters. Specifically it validates that importers do not peek at the + underlying struct page when they import a buffer. + +config DMABUF_SELFTESTS + tristate "Selftests for the dma-buf interfaces" + default n + depends on DMA_SHARED_BUFFER + +menuconfig DMABUF_HEAPS + bool "DMA-BUF Userland Memory Heaps" + select DMA_SHARED_BUFFER + help + Choose this option to enable the DMA-BUF userland memory heaps. + This options creates per heap chardevs in /dev/dma_heap/ which + allows userspace to allocate dma-bufs that can be shared + between drivers. + +menuconfig DMABUF_SYSFS_STATS + bool "DMA-BUF sysfs statistics (DEPRECATED)" + depends on DMA_SHARED_BUFFER + help + Choose this option to enable DMA-BUF sysfs statistics + in location /sys/kernel/dmabuf/buffers. + + /sys/kernel/dmabuf/buffers/<inode_number> will contain + statistics for the DMA-BUF with the unique inode number + <inode_number>. + + This option is deprecated and should sooner or later be removed. + Android is the only user of this and it turned out that this resulted + in quite some performance problems. + +source "drivers/dma-buf/heaps/Kconfig" + +endmenu |